Dielectric characterization of microwave sintered lead zirconate titanate ceramics

Autor(es)

Goncalves, Mayra D. ; Souza, Flavio L. ; Longo, Elson ; Leite, Edson R. ; Camargo, Emerson R.

• Tipo de documento: Artigo Científico
• Fonte: CERAMICS INTERNATIONAL; v. 42, n. 13, p. 14423-14430, OCT 2016.
• Citações Web of Science: 6

Resumo

Highly reactive lead zirconate titanate powders (PZT) with different compositions were successfully synthesized by the oxidant-peroxo method (OPM) and used to prepare dense ceramic samples with composition near to the morphotropic phase boundary (MPB) sintered at 1000 degrees C for 2 h using a tubular conventional oven and a commercial microwave system. Crystalline phases were identified in the powder and ceramic samples by X-ray powder diffraction and FT-Raman spectroscopy at room temperature. The fractured surface of the ceramic sample showed a high degree of densification with fairly uniform grain sizes. Dielectric constants measured in the range from 30 to 500 degrees C at different frequencies (1,10 and 100 kHz) indicated a normal ferroelectric behavior regardless of the sintering method. Samples sintered by a microwave radiation (MW) method and composition near to the MPB region showed a maximum dielectric constant of 17.911 and an anomalous high Curie temperature of 465 degrees C. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved. (AU)

• Processo FAPESP: 09/01587-0 - Perovskitas baseadas no PZT modificadas com terras raras sintetizadas usando o método dos complexos oxidantes de peróxido (OPM) e caracterizadas com uso complementar de espectroscopia Raman, difração de raios-X e microscopia eletrônica.
• Beneficiário: Mayra Dancini Gonçalves
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 07/50904-2 - Perovskitas baseadas no titanato de chumbo modificadas com terras raras sintetizadas usando o método dos complexos oxidantes de peróxido (OPM - the oxidant-peroxide method) e caracterizadas com uso complementar de espectroscopia Raman, infravermelho e difração de raios X
• Beneficiário: Alexandre Henrique Pinto
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica